Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm...
[linux-2.6.git] / arch / arm / mach-clps711x / common.c
1 /*
2  *  linux/arch/arm/mach-clps711x/core.c
3  *
4  *  Core support for the CLPS711x-based machines.
5  *
6  *  Copyright (C) 2001,2011 Deep Blue Solutions Ltd
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22 #include <linux/kernel.h>
23 #include <linux/mm.h>
24 #include <linux/init.h>
25 #include <linux/interrupt.h>
26 #include <linux/io.h>
27 #include <linux/irq.h>
28 #include <linux/sched.h>
29 #include <linux/timex.h>
30
31 #include <asm/sizes.h>
32 #include <mach/hardware.h>
33 #include <asm/irq.h>
34 #include <asm/leds.h>
35 #include <asm/pgtable.h>
36 #include <asm/page.h>
37 #include <asm/mach/map.h>
38 #include <asm/mach/time.h>
39 #include <asm/hardware/clps7111.h>
40 #include <asm/system_misc.h>
41
42 /*
43  * This maps the generic CLPS711x registers
44  */
45 static struct map_desc clps711x_io_desc[] __initdata = {
46         {
47                 .virtual        = CLPS7111_VIRT_BASE,
48                 .pfn            = __phys_to_pfn(CLPS7111_PHYS_BASE),
49                 .length         = SZ_1M,
50                 .type           = MT_DEVICE
51         }
52 };
53
54 void __init clps711x_map_io(void)
55 {
56         iotable_init(clps711x_io_desc, ARRAY_SIZE(clps711x_io_desc));
57 }
58
59 static void int1_mask(struct irq_data *d)
60 {
61         u32 intmr1;
62
63         intmr1 = clps_readl(INTMR1);
64         intmr1 &= ~(1 << d->irq);
65         clps_writel(intmr1, INTMR1);
66 }
67
68 static void int1_ack(struct irq_data *d)
69 {
70         u32 intmr1;
71
72         intmr1 = clps_readl(INTMR1);
73         intmr1 &= ~(1 << d->irq);
74         clps_writel(intmr1, INTMR1);
75
76         switch (d->irq) {
77         case IRQ_CSINT:  clps_writel(0, COEOI);  break;
78         case IRQ_TC1OI:  clps_writel(0, TC1EOI); break;
79         case IRQ_TC2OI:  clps_writel(0, TC2EOI); break;
80         case IRQ_RTCMI:  clps_writel(0, RTCEOI); break;
81         case IRQ_TINT:   clps_writel(0, TEOI);   break;
82         case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
83         }
84 }
85
86 static void int1_unmask(struct irq_data *d)
87 {
88         u32 intmr1;
89
90         intmr1 = clps_readl(INTMR1);
91         intmr1 |= 1 << d->irq;
92         clps_writel(intmr1, INTMR1);
93 }
94
95 static struct irq_chip int1_chip = {
96         .irq_ack        = int1_ack,
97         .irq_mask       = int1_mask,
98         .irq_unmask     = int1_unmask,
99 };
100
101 static void int2_mask(struct irq_data *d)
102 {
103         u32 intmr2;
104
105         intmr2 = clps_readl(INTMR2);
106         intmr2 &= ~(1 << (d->irq - 16));
107         clps_writel(intmr2, INTMR2);
108 }
109
110 static void int2_ack(struct irq_data *d)
111 {
112         u32 intmr2;
113
114         intmr2 = clps_readl(INTMR2);
115         intmr2 &= ~(1 << (d->irq - 16));
116         clps_writel(intmr2, INTMR2);
117
118         switch (d->irq) {
119         case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
120         }
121 }
122
123 static void int2_unmask(struct irq_data *d)
124 {
125         u32 intmr2;
126
127         intmr2 = clps_readl(INTMR2);
128         intmr2 |= 1 << (d->irq - 16);
129         clps_writel(intmr2, INTMR2);
130 }
131
132 static struct irq_chip int2_chip = {
133         .irq_ack        = int2_ack,
134         .irq_mask       = int2_mask,
135         .irq_unmask     = int2_unmask,
136 };
137
138 void __init clps711x_init_irq(void)
139 {
140         unsigned int i;
141
142         for (i = 0; i < NR_IRQS; i++) {
143                 if (INT1_IRQS & (1 << i)) {
144                         irq_set_chip_and_handler(i, &int1_chip,
145                                                  handle_level_irq);
146                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
147                 }
148                 if (INT2_IRQS & (1 << i)) {
149                         irq_set_chip_and_handler(i, &int2_chip,
150                                                  handle_level_irq);
151                         set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
152                 }
153         }
154
155         /*
156          * Disable interrupts
157          */
158         clps_writel(0, INTMR1);
159         clps_writel(0, INTMR2);
160
161         /*
162          * Clear down any pending interrupts
163          */
164         clps_writel(0, COEOI);
165         clps_writel(0, TC1EOI);
166         clps_writel(0, TC2EOI);
167         clps_writel(0, RTCEOI);
168         clps_writel(0, TEOI);
169         clps_writel(0, UMSEOI);
170         clps_writel(0, SYNCIO);
171         clps_writel(0, KBDEOI);
172 }
173
174 /*
175  * gettimeoffset() returns time since last timer tick, in usecs.
176  *
177  * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy.
178  * 'tick' is usecs per jiffy.
179  */
180 static unsigned long clps711x_gettimeoffset(void)
181 {
182         unsigned long hwticks;
183         hwticks = LATCH - (clps_readl(TC2D) & 0xffff);  /* since last underflow */
184         return (hwticks * (tick_nsec / 1000)) / LATCH;
185 }
186
187 /*
188  * IRQ handler for the timer
189  */
190 static irqreturn_t p720t_timer_interrupt(int irq, void *dev_id)
191 {
192         timer_tick();
193         return IRQ_HANDLED;
194 }
195
196 static struct irqaction clps711x_timer_irq = {
197         .name           = "CLPS711x Timer Tick",
198         .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
199         .handler        = p720t_timer_interrupt,
200 };
201
202 static void __init clps711x_timer_init(void)
203 {
204         struct timespec tv;
205         unsigned int syscon;
206
207         syscon = clps_readl(SYSCON1);
208         syscon |= SYSCON1_TC2S | SYSCON1_TC2M;
209         clps_writel(syscon, SYSCON1);
210
211         clps_writel(LATCH-1, TC2D); /* 512kHz / 100Hz - 1 */
212
213         setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
214
215         tv.tv_nsec = 0;
216         tv.tv_sec = clps_readl(RTCDR);
217         do_settimeofday(&tv);
218 }
219
220 struct sys_timer clps711x_timer = {
221         .init           = clps711x_timer_init,
222         .offset         = clps711x_gettimeoffset,
223 };
224
225 void clps711x_restart(char mode, const char *cmd)
226 {
227         soft_restart(0);
228 }
229
230 static void clps711x_idle(void)
231 {
232         clps_writel(1, HALT);
233         __asm__ __volatile__(
234         "mov    r0, r0\n\
235         mov     r0, r0");
236 }
237
238 static int __init clps711x_idle_init(void)
239 {
240         arm_pm_idle = clps711x_idle;
241         return 0;
242 }
243
244 arch_initcall(clps711x_idle_init);